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Fair Value of Financial Instruments (Details) - Level 1 [Member] - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Other Assets [Member]    
Fair Values of Financial Instruments [Abstract]    
Deferred compensation plans $ 9.2 $ 7.9
Other Liabilities [Member]    
Fair Values of Financial Instruments [Abstract]    
Deferred compensation plans $ 9.2 $ 8.1